Reverse shoulder joint prosthesis connecting piece

Abstract

The utility model discloses a reverse shoulder joint prosthesis connecting piece which comprises a main installation assembly, a positioning assembly is arranged on one end face of the main installation assembly, a plurality of main fixing assemblies are arranged on the main installation assembly, and a connecting assembly is arranged on the end face, away from the positioning assembly, of the main installation assembly. And a shoulder glenoid ball head is arranged on the connecting assembly. The reverse shoulder joint prosthesis connecting piece has the advantages that the reverse shoulder joint prosthesis connecting piece is used for prosthesis replacement of the shoulder blade side in reverse shoulder joint replacement and treatment of rotator cuff injuries, the occurrence of shoulder blade lower incisura can be effectively prevented, and meanwhile different eccentric shafts can be selected when the reverse shoulder joint prosthesis connecting piece is matched with different patient conditions.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a reverse shoulder joint prosthesis connector. Background Technology

[0002] Traditional total shoulder arthroplasty is widely used and effective in treating shoulder osteoarthritis, rheumatoid arthritis, and avascular necrosis of the humeral head. However, it has a high failure rate in rotator cuff joint disease. Although hemiarthroplasty avoids glenoid prosthesis loosening, progressive glenoid wear leads to unsatisfactory mid- to long-term outcomes. RTSA (Remotely Transplantable Shoulder Arthroplasty) is more effective in treating rotator cuff joint disease, effectively relieving shoulder pain and improving abduction ability.

[0003] Glenoid notch is one of the most common complications of RTSA, with an incidence rate as high as 56% to 96%. The main reason is that the humeral end prosthesis or metaphyseal bone impacts the lower segment of the scapular neck. At the same time, the polyethylene particles generated after the impact can cause local aseptic inflammation, leading to osteolysis of the lower segment of the glenoid neck. The main methods are as follows: (1) Lower the position of the glenoid base and glenoid ball to increase the distance between the glenoid and the humeral end; (2) Select a larger glenoid ball and an appropriate glenoid ball eccentricity; (3) Lower the neck-shaft angle of the humeral prosthesis or use bone grafting to increase the lateral displacement of the glenoid ball, so that the center of rotation moves outward, thereby reducing the occurrence of impact [11,23); (4) Tilting the ball inward at a certain angle (15° to 30°) can effectively avoid the collision between the humeral end and the glenoid during joint adduction, thereby reducing the formation of glenoid notch. The existing product requires an additional off-center ball head design, which requires more material. Therefore, a reverse shoulder joint prosthesis connector needs to be designed. Utility Model Content

[0004] The purpose of this invention is to solve the above problems by designing a reverse shoulder joint prosthesis connector.

[0005] To achieve the above objectives, the technical solution of this utility model is a reverse shoulder joint prosthesis connector, comprising a main mounting component, a positioning component provided on one end face of the main mounting component, a plurality of main fixing components provided on the main mounting component, a connecting component provided on the end face of the main mounting component away from the positioning component, and a glenoid ball head provided on the connecting component.

[0006] As a further description of this technical solution, the main mounting assembly includes a main mounting shoulder backplate, and a plurality of main fixing components are provided on the main mounting shoulder backplate.

[0007] As a further description of this technical solution, the positioning component includes a positioning cylinder disposed on one end face of the main mounting shoulder back plate.

[0008] As a further description of this technical solution, the main fixing component includes a plurality of fixing holes disposed on the main mounting component.

[0009] As a further description of this technical solution, the connecting assembly includes a first connecting cylinder disposed on the end face of the main mounting assembly away from the positioning assembly, a second connecting cylinder disposed on the first connecting cylinder, the first connecting cylinder and the second connecting cylinder being fixed by a first connecting screw, the second connecting cylinder being provided with an eccentric connecting hole, and the second connecting cylinder being provided with a shoulder ball head.

[0010] As a further description of this technical solution, the shoulder ball head is connected to the eccentric connection hole of the second connecting cylinder through an eccentric shaft.

[0011] Its beneficial effects are that the reverse shoulder joint prosthesis connector of this technical solution is used for prosthesis replacement on the scapular side in reverse shoulder joint replacement surgery, and is used for the treatment of rotator cuff injuries. It can effectively prevent the occurrence of the infrascapular notch, and different eccentric axes can be selected when matching different patient conditions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the installation structure of the shoulder ball head of this utility model;

[0013] Figure 2 This is a schematic diagram of the eccentric connecting hole of this utility model.

[0014] In the diagram, 1. Main mounting component; 2. Positioning component; 3. Main fixing component; 4. Connecting component; 5. Shoulder ball head; 6. Main mounting shoulder back plate; 7. Positioning cylinder; 8. Fixing hole; 9. First connecting cylinder; 10. Second connecting cylinder; 11. First connecting screw; 12. Eccentric connecting hole; 13. Eccentric shaft. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1 As shown, a reverse shoulder joint prosthesis connector includes a main mounting assembly 1. The main mounting assembly 1 will be described in detail below. The main mounting assembly 1 includes a main mounting glenoid backplate 6, and a plurality of main fixation assemblies 3 are provided on the main mounting glenoid backplate 6.

[0016] To facilitate the installation and positioning of the main mounting component 1, a positioning component 2 is provided on one end face of the main mounting component 1. The positioning component 2 will be described in detail below. The positioning component 2 includes a positioning cylinder 7 provided on one end face of the main mounting shoulder plate 6.

[0017] To facilitate the fixing of the main mounting component 1, a number of main fixing components 3 are provided on the main mounting component 1. The main fixing components 3 will be described in detail below. The main fixing components 3 include a number of fixing holes 8 provided on the main mounting component 1.

[0018] To facilitate connection and installation with the girdle ball head 5, the connecting component 4 is provided with the girdle ball head 5. The connecting component 4 is provided on the end face of the main mounting component 1 away from the positioning component 2. The connecting component 4 will be described in detail below. The connecting component 4 includes a first connecting cylinder 9 provided on the end face of the main mounting component 1 away from the positioning component 2. A second connecting cylinder 10 is provided on the first connecting cylinder 9. The first connecting cylinder 9 and the second connecting cylinder 10 are fixed by a first connecting screw 11. An eccentric connecting hole 12 is provided on the second connecting cylinder 10. The girdle ball head 5 is provided on the second connecting cylinder 10. The girdle ball head 5 is connected to the eccentric connecting hole 12 of the second connecting cylinder 10 through an eccentric shaft 13.

[0019] The specific structure of this utility model has been described in detail above. The working principle of this utility model will be explained below: After the installation of the main glenoid back plate 6 is completed, the first connecting cylinder 9 and the second connecting cylinder 10 are fixed by the first connecting screw 11 and fixed on the main glenoid back plate 6 by the first connecting screw 11. Then, the glenoid ball head 5 is installed on the second connecting cylinder 10 by the eccentric shaft 13. The eccentric shaft 13 is connected to the eccentric connecting hole 12 of the second connecting cylinder 10. Different eccentric shafts can be selected when matching different patient conditions. The reverse shoulder joint prosthesis connector of this technical solution is used for the prosthesis replacement on the scapular side in the reverse shoulder joint replacement surgery and is used for the treatment of rotator cuff injury. It can effectively prevent the occurrence of the infrascapular notch. At the same time, different eccentric shafts can be selected when matching different patient conditions.

[0020] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A reverse shoulder joint prosthesis connector, characterized in that, It includes a main mounting component (1), a positioning component (2) is provided on one end face of the main mounting component (1), a plurality of main fixing components (3) are provided on the main mounting component (1), a connecting component (4) is provided on the end face of the main mounting component (1) away from the positioning component (2), and a shoulder ball head (5) is provided on the connecting component (4).

2. The reverse shoulder joint prosthesis connector according to claim 1, characterized in that, The main mounting assembly (1) includes a main mounting shoulder back plate (6), on which a plurality of main fixing assemblies (3) are provided.

3. The reverse shoulder joint prosthesis connector according to claim 1, characterized in that, The positioning component (2) includes a positioning cylinder (7) disposed on one end face of the main mounting shoulder back plate (6).

4. The reverse shoulder joint prosthesis connector according to claim 1, characterized in that, The main fixing component (3) includes a plurality of fixing holes (8) provided on the main mounting component (1).

5. A reverse shoulder joint prosthesis connector according to claim 1, characterized in that, The connecting assembly (4) includes a first connecting cylinder (9) disposed on the end face of the main mounting assembly (1) away from the positioning assembly (2), a second connecting cylinder (10) disposed on the first connecting cylinder (9), the first connecting cylinder (9) and the second connecting cylinder (10) being fixed by a first connecting screw (11), an eccentric connecting hole (12) disposed on the second connecting cylinder (10), and a shoulder ball head (5) disposed on the second connecting cylinder (10).

6. A reverse shoulder joint prosthesis connector according to claim 5, characterized in that, The shoulder ball head (5) is connected to the eccentric connection hole (12) of the second connecting cylinder (10) through the eccentric shaft (13).

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